Magnetic memory medium, method of manufacturing the same and magnetic disc apparatus
AssigneeFujitsu Limited
InventorsHiroto Takeshita, Wataru Yamagishi
Life of this patent
Estimating the term…
Abstract
The surface of a disk medium includes a substrate whose surface includes grooves and lands. A non-magnetic underlayer and a magnetic recording layer are formed on the substrate. Smoothing non-magnetic film fills the grooves, which are covered with the non-magnetic underlayer and the magnetic recording layer, so that the height of the magnetic recording layer above the grooves may reach the same level as the height of the magnetic recording layer above the lands.
Claims12
A magnetic memory medium characterized in comprising:
- substrate on which groove and land are formed;
- magnetic film laminated on said substrate;
- and
- non-magnetic film deposited on said magnetic film on said groove up to the position higher than the land of substrate.
A method of manufacturing a magnetic memory medium characterized in comprising the steps of:
- laminating a magnetic film on a substrate where the groove and land are formed;
- laminating a non-magnetic film on said magnetic film;
- and
- heating said non-magnetic film up to the temperature higher than the melting point of said non-magnetic film.
A magnetic disc apparatus characterized in comprising:
- magnetic disc including a substrate on which groove and land are formed, a magnetic film laminated on said substrate and a non-magnetic film deposited up to the height higher than the land of said substrate on said magnetic film on said groove;
- spindle motor for rotating said magnetic disc;
- head for writing or reading data to or from said magnetic disc;
- and
- actuator for moving said head in the radius direction of said magnetic disc.
Dependencies are inferred from the claim text.